Carboniferous swamps relatives of seedless vascular plants

Question: Parasympathetic innervation to glands will usually result in increased secretion. There is a particular type of gland for which this is not true. That type of gland is? and what this gland belong to?

Question: The Carboniferous swamps were dominated by many extinct relatives of seedless vascular plants. Surviving taxa of these groups are rather small in size compared to their gigantic relatives. Hypothesize about 2 factors that could explain why these plants no longer dominate the flora today.

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